/*
 * Copyright © 2001 Stephen Williams (steve@icarus.com)
 * Copyright © 2001-2002 David Brownell (dbrownell@users.sourceforge.net)
 * Copyright © 2008 Roger Williams (rawqux@users.sourceforge.net)
 * Copyright © 2012 Pete Batard (pete@akeo.ie)
 * Copyright © 2013 Federico Manzan (f.manzan@gmail.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdarg.h>
#include <sys/types.h>
#include <getopt.h>

#include "libusb.h"
#include "ezusb.h"

#if !defined(_WIN32) || defined(__CYGWIN__ )
#include <syslog.h>
static bool dosyslog = false;
#include <strings.h>
#define _stricmp strcasecmp
#endif

#ifndef FXLOAD_VERSION
#define FXLOAD_VERSION (__DATE__ " (libusb)")
#endif

#ifndef ARRAYSIZE
#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif

void logerror(const char *format, ...)
    __attribute__ ((format (__printf__, 1, 2)));

void logerror(const char *format, ...)
{
    va_list ap;
    va_start(ap, format);

#if !defined(_WIN32) || defined(__CYGWIN__ )
    if (dosyslog)
        vsyslog(LOG_ERR, format, ap);
    else
#endif
        vfprintf(stderr, format, ap);
    va_end(ap);
}

static int print_usage(int error_code) {
    fprintf(stderr, "\nUsage: fxload [-v] [-V] [-t type] [-d vid:pid] [-p bus,addr] -i firmware\n");
    fprintf(stderr, "  -i <path>       -- Firmware to upload\n");
    fprintf(stderr, "  -t <type>       -- Target type: an21, fx, fx2, fx2lp, fx3\n");
    fprintf(stderr, "  -d <vid:pid>    -- Target device, as an USB VID:PID\n");
    fprintf(stderr, "  -p <bus,addr>   -- Target device, as a libusb bus number and device address path\n");
    fprintf(stderr, "  -v              -- Increase verbosity\n");
    fprintf(stderr, "  -q              -- Decrease verbosity (silent mode)\n");
    fprintf(stderr, "  -V              -- Print program version\n");
    return error_code;
}

#define FIRMWARE 0
#define LOADER 1
int main(int argc, char*argv[])
{
    fx_known_device known_device[] = FX_KNOWN_DEVICES;
    const char *path[] = { NULL, NULL };
    const char *device_id = NULL;
    const char *device_path = getenv("DEVICE");
    const char *type = NULL;
    const char *fx_name[FX_TYPE_MAX] = FX_TYPE_NAMES;
    const char *ext, *img_name[] = IMG_TYPE_NAMES;
    int fx_type = FX_TYPE_UNDEFINED, img_type[ARRAYSIZE(path)];
    int i, j, opt, status;
    unsigned vid = 0, pid = 0;
    unsigned busnum = 0, devaddr = 0, _busnum, _devaddr;
    libusb_device *dev, **devs;
    libusb_device_handle *device = NULL;
    struct libusb_device_descriptor desc;

    while ((opt = getopt(argc, argv, "qvV?hd:p:i:I:t:")) != EOF)
        switch (opt) {

        case 'd':
            device_id = optarg;
            if (sscanf(device_id, "%x:%x" , &vid, &pid) != 2 ) {
                fputs ("please specify VID & PID as \"vid:pid\" in hexadecimal format\n", stderr);
                return -1;
            }
            break;

        case 'p':
            device_path = optarg;
            if (sscanf(device_path, "%u,%u", &busnum, &devaddr) != 2 ) {
                fputs ("please specify bus number & device number as \"bus,dev\" in decimal format\n", stderr);
                return -1;
            }
            break;

        case 'i':
        case 'I':
            path[FIRMWARE] = optarg;
            break;

        case 'V':
            puts(FXLOAD_VERSION);
            return 0;

        case 't':
            type = optarg;
            break;

        case 'v':
            verbose++;
            break;

        case 'q':
            verbose--;
            break;

        case '?':
        case 'h':
        default:
            return print_usage(-1);

    }

    if (path[FIRMWARE] == NULL) {
        logerror("no firmware specified!\n");
        return print_usage(-1);
    }
    if ((device_id != NULL) && (device_path != NULL)) {
        logerror("only one of -d or -a can be specified\n");
        return print_usage(-1);
    }

    /* determine the target type */
    if (type != NULL) {
        for (i=0; i<FX_TYPE_MAX; i++) {
            if (strcmp(type, fx_name[i]) == 0) {
                fx_type = i;
                break;
            }
        }
        if (i >= FX_TYPE_MAX) {
            logerror("illegal microcontroller type: %s\n", type);
            return print_usage(-1);
        }
    }

    /* open the device using libusb */
    status = libusb_init(NULL);
    if (status < 0) {
        logerror("libusb_init() failed: %s\n", libusb_error_name(status));
        return -1;
    }
    libusb_set_debug(NULL, verbose);

    /* try to pick up missing parameters from known devices */
    if ((type == NULL) || (device_id == NULL) || (device_path != NULL)) {
        if (libusb_get_device_list(NULL, &devs) < 0) {
            logerror("libusb_get_device_list() failed: %s\n", libusb_error_name(status));
            goto err;
        }
        for (i=0; (dev=devs[i]) != NULL; i++) {
            _busnum = libusb_get_bus_number(dev);
            _devaddr = libusb_get_device_address(dev);
            if ((type != NULL) && (device_path != NULL)) {
                // if both a type and bus,addr were specified, we just need to find our match
                if ((libusb_get_bus_number(dev) == busnum) && (libusb_get_device_address(dev) == devaddr))
                    break;
            } else {
                status = libusb_get_device_descriptor(dev, &desc);
                if (status >= 0) {
                    if (verbose >= 3) {
                        logerror("examining %04x:%04x (%d,%d)\n",
                            desc.idVendor, desc.idProduct, _busnum, _devaddr);
                    }
                    for (j=0; j<ARRAYSIZE(known_device); j++) {
                        if ((desc.idVendor == known_device[j].vid)
                            && (desc.idProduct == known_device[j].pid)) {
                            if (// nothing was specified
                                ((type == NULL) && (device_id == NULL) && (device_path == NULL)) ||
                                // vid:pid was specified and we have a match
                                ((type == NULL) && (device_id != NULL) && (vid == desc.idVendor) && (pid == desc.idProduct)) ||
                                // bus,addr was specified and we have a match
                                ((type == NULL) && (device_path != NULL) && (busnum == _busnum) && (devaddr == _devaddr)) ||
                                // type was specified and we have a match
                                ((type != NULL) && (device_id == NULL) && (device_path == NULL) && (fx_type == known_device[j].type)) ) {
                                fx_type = known_device[j].type;
                                vid = desc.idVendor;
                                pid = desc.idProduct;
                                busnum = _busnum;
                                devaddr = _devaddr;
                                break;
                            }
                        }
                    }
                    if (j < ARRAYSIZE(known_device)) {
                        if (verbose)
                            logerror("found device '%s' [%04x:%04x] (%d,%d)\n",
                                known_device[j].designation, vid, pid, busnum, devaddr);
                        break;
                    }
                }
            }
        }
        if (dev == NULL) {
            libusb_free_device_list(devs, 1);
            logerror("could not find a known device - please specify type and/or vid:pid and/or bus,dev\n");
            return print_usage(-1);
        }
        status = libusb_open(dev, &device);
        if (status < 0) {
            logerror("libusb_open() failed: %s\n", libusb_error_name(status));
            goto err;
        }
        libusb_free_device_list(devs, 1);
    } else if (device_id != NULL) {
        device = libusb_open_device_with_vid_pid(NULL, (uint16_t)vid, (uint16_t)pid);
        if (device == NULL) {
            logerror("libusb_open() failed\n");
            goto err;
        }
    }

    /* We need to claim the first interface */
    libusb_set_auto_detach_kernel_driver(device, 1);
    status = libusb_claim_interface(device, 0);
    if (status != LIBUSB_SUCCESS) {
        logerror("libusb_claim_interface failed: %s\n", libusb_error_name(status));
        goto err;
    }

    if (verbose)
        logerror("microcontroller type: %s\n", fx_name[fx_type]);

    for (i=0; i<ARRAYSIZE(path); i++) {
        if (path[i] != NULL) {
            ext = path[i] + strlen(path[i]) - 4;
            if ((_stricmp(ext, ".hex") == 0) || (strcmp(ext, ".ihx") == 0))
                img_type[i] = IMG_TYPE_HEX;
            else if (_stricmp(ext, ".iic") == 0)
                img_type[i] = IMG_TYPE_IIC;
            else if (_stricmp(ext, ".bix") == 0)
                img_type[i] = IMG_TYPE_BIX;
            else if (_stricmp(ext, ".img") == 0)
                img_type[i] = IMG_TYPE_IMG;
            else {
                logerror("%s is not a recognized image type\n", path[i]);
                goto err;
            }
        }
        if (verbose && path[i] != NULL)
            logerror("%s: type %s\n", path[i], img_name[img_type[i]]);
    }

    /* single stage, put into internal memory */
    if (verbose > 1)
        logerror("single stage: load on-chip memory\n");
    status = ezusb_load_ram(device, path[FIRMWARE], fx_type, img_type[FIRMWARE], 0);

    libusb_release_interface(device, 0);
    libusb_close(device);
    libusb_exit(NULL);
    return status;
err:
    libusb_exit(NULL);
    return -1;
}

